Sandal upper



FIG. 1 is a perspective view of a sandal upper showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The broken lines illustrating the sole forms no part of the claim.

CLAIM The ornamental design for sandal upper, as shown and described.